When Miki attempts to summon a demon on the roof of her high school, things don’t go quite as planned. Not only does she instigate a vicious massacre, but her friend Akira gets possessed by the legendary demon Amon the Uneater, who annihilates his own kind. As Tokyo’s streets grow bloodier by the day–thanks to invaders from Hell–a demonic demon slayer might be the city’s only hope for salvation.